My PC monitor and TV is connected via DVI cables (TV is DVI->HDMI, DVI from PC and HDMI to TV..).
It seams to be running smoothly! but if I drag a video / youtube clip to the TV the PC monitor will have performance issues :S

if the video is playing on PC monitor, everything is smooth on both screens.
If the video is playing on TV, the TV is smooth but PC monitor will get laggy when scrolling or moving windows around :S
My GPU reports spikes when I start the movie, and a few seconds after it will go to idle (I suspect this is normal?)

Im not sure what other informations is needed for help on this subject..

for the display managing software, I was asking because it could be an issue. i used display fusion for managing 3 monitors at work that were used when my laptop was on a dock, and i could set hot keys to realign the monitors how i liked them.

display port is cool, that and dual link DVI are the only ways of viewing over 1080p (1440p) however, typically only more expensive monitors will even have the port. the good part about display ports, is that because they are digital, they can carry audio, and can be converted to almost any different connector.

judging by images of the card on newegg, it looks like there is also an hdmi port on the card. have you tried just using a straight hdmi cord instead of converter?

I have JUST tried with TV via HDMI and monitor via DVI.. same problem.

yea and this was with much better TV than mine.. still no improvement. maybe my PC monitor is to blame? or codex? I will definitely play around with it the next dew days
maybe Ill find something at some point